DESCRIPTION

It allows Canon EF lenses to be used with Micro Four Thirds mount cameras with full electronic iris / aperture lens control from within the camera. It works so seamlessly, you control the Canon EF lens from within the camera settings, just like controlling a Canon EF lens on a 5D or C300, etc.

This adapter is the Speed Booster S version, it has an internal lens which increases the maximum aperture by 1 x stop. So whatever lens / aperture your are using, you gain 1 x stop of additional light, this is great for low light shooting. It also increases MTF and makes the lens you are using wider by a factor of 0.71. This adapter provides excellent results which are free from vignetting and lens distortion, very impressive!

It uses high performance 32-bit technology, it is fully electronic and is powered by the camera body.